listbox

菜鸟提问：谁可以告诉我，怎么在listbox显示的文件信息中点右键添加删除选项using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using ClassLibrary1;namespace WindowsApplication7
{
    public partial class fmMain : Form
    {
        private string _savePath; 
        public fmMain()
        {
            InitializeComponent();
        }
        private void bnSearch_Click(object sender, EventArgs e)
        {
            SearchDIR result = new SearchDIR();
            result.path = "c:\\1";
            _savePath = result.GetPath();
        }        private void button1_Click_1(object sender, EventArgs e)
        {
            char[] charSeparatory = new char[] { '|' };
            string[] resultPath;
            resultPath = _savePath.Split(charSeparatory, StringSplitOptions.RemoveEmptyEntries);
            for (int i = 0; i < resultPath.Length; i++)
            {
                listBox1.Items.Add(resultPath[i]);
            }
        }
        private void listBox1_DoubleClick(object sender, EventArgs e)
        {
            if (listBox1.SelectedItem != null)
            {
                string curItem = listBox1.SelectedItem.ToString();
                int j = curItem.LastIndexOf('\\');
                string text = curItem.Remove(j);
                System.Diagnostics.Process.Start("explorer.exe", text);
            }
        }
    }
}